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 <strong>Iterative solvers</strong>
  <ul>
   <li>BiCG - BiConjugate gradients.</li>
   <li>BiCGstab - BiConjugate gradients stabilized.</li>
   <li>CG - Conjugate gradients.</li>
   <li>CGS - Conjugate gradients squared.</li>
   <li>Chebyshev - The Chebyshev iteration for symmetrical, positive definite matrices.</li>
   <li>GMRES - Generalized minimal residual using restart.</li>
   <li>IR - Iterative refinement (Richardson's method).</li>
   <li>QMR - Quasi-minimal residual.</li>
   <li>HyBR - Hybrid Bidiagonalization Regularization.</li>   
   <li>MRNSD - Modified Residual Norm Steepest Descent.</li>
   <li>CGLS - Conjugate Gradient for Least Squares.</li>   
  </ul>
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